Sewing-machine shuttle.



P. H. PERRY. SEWING-MACHINE SHUTTLE.

2 1 9 1 9 L D A d 6 n w a D "EMIII COLUMBIA PMNQGRAPH Cm, WASHINGTON, D.c.

UNITED STATES PATENT OFFICE.

FREDERICK I-I. PERRY, OF BEVERLY, MASSACHUSETTS, A SSIGNOR TO UNITEDSHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, CORPORATION OF NEWJERSEY.

SEWING-MACHINE SHUTTLE.

Specification of Letters Patent.

Patented Apr. 9, 1912.

ToaZZ whom 'it may concern:

Be it known that I, FREDERICK H. PERRY, a citizen of the United States,residing at Beverly, in the county of Essex and State of Massachusetts,have invented certain new and useful Improvements in Sewing-MachineShuttles; and I do hereby declare the following tobe a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The present invention relates to sewing machine shuttles.

The object of the present invention is to provide a shuttle which willdeliver a plurality of shuttle threads to the stitch forming mechanismwhereby a stronger stitch may be formed.

1n lock stitch sewing machines one thread, known as the needle thread,is drawn through the work in a loop by the needle, and a second thread,known as the shuttle thread, is passed through theloop of needle threadso that when the stitch is set, the needle and the shuttle threads crossone another forming a lock in the stitch. This lock is ordinarily theweakest part of the stitch, since at the lock the two threads lie overeach other in sharply bent bights and are likely to out through eachother at this point when the stitch is subjected to strain in use. Thepresent invention contemplates strengthening the lock of the stitch byproviding two or more shuttle threads. The use of two or more shuttlethreads provides a greater bearing surface between the threads at thelock so that they do not asreadily cut through each other at this point.

The present invention is particularly ap plicable to the operation ofsewing on the outsole of a shoe. The outsole'stitching is subjected tocomparatively little strain along the ball and toe portions of the shoe,whereas it is subjected to a considerably greater strainalong the shankof the shoe.

In the application of the present invention to sewing on the outsole ofa shoe, a single shuttle thread is preferably used in sewing along theball and toe portions of the outsole and an additional thread is drawnfrom the shuttle in sewing along the shank, thus forming a strongerstitch with r two shuttle threads along the shank portion.

When the shuttle is used for laying an extra thread in the stitch alongthe shank of the from the shuttle to strengthen the stitch along theshank of the outsole. The shuttle of the present invention, however, isnot limited in use to this particular application, but such a shuttlemay he used to deliver two threads throughout the entire stitchingoperation of uniting the outsole to a shoe, and may be equally wellemployed in stitchingany kind of material in which it is d'esired to sewa stronger lock stitch, such as in sewing harness, etc.

A preferred embodiment of the present invention is illustrated asapplied to an oscillatory shuttle of the kind commonly employed in alock stitch sewing machine of the type known to the trade as theGoodyear rapid outsole stitcher, which is described and illustrated withsubstantial accuracy in the patent to French and Meyer, No. 473,870,April 26, 1892.

1 Referring to the drawings in which the preferred embodiment of thepresent invention is illustrated, Figure 1 is a front view of theshuttle showing also a cross section of work in whicha lock stitch issewed partly with a single shuttle thread and partly with two shuttlethreads, Fig. 2 is a bottom view of the bobbin case, and Fig. 3 is across section of the bobbin case and inclosed bobbins taken along theline 3-3, of Fig. 1.

As illustrated the shuttle comprises a substantially discoidal shuttlebody 1, a bobbin case :2 rotatably mounted therein, and twothread-carrying bobbins 3 and at inclosed in the bobbin case. The meanswhich cooperate to oscillate the shuttle and to hold the bob bin case inplace are illustrated and described in the above-mentioned French andMeyer patent and no description thereof is here considered to benecessary.

The bobbin case 2 is a round cup-shaped body comprising an annularflange 5 and a fiat front wall 6 from whose center projects a pin orpost 7 upon which are rotatably mounted the bobbins 3 and 4. The outersurface of the flange 5 is recessed at 8 to provide a space for threadtension springs 9 whose ends 10 frictionally hold the threads againstthe side walls 11 of said recesses. The springs 9 are secured in placeby screws 12 which pass through from the front of the bobbin case andsecure the other ends 13 of the springs 9 against the front walls ofapertures 14 cut through the flange 5. The apertures 14 allow theclamped ends 13 of the springs 9 to be of a width equal to the thicknessof the flange wall 5. The thread 15 is drawn from the bobbin 3, throughthe aperture 16 in the flange 5, then under the end 10 of one of thetension springs 9, and outwardly through the aperture 17 formed in abutton 18 projecting forwardly from the lower edge of the front wall 6of the bobbin case. The thread 19 is similarly drawn from the bobbin 4,through the aperture 20 in the flange 5, then under the end 10 of theother tension spring 9, and outwardly to the aperture 21 in the button18. The bobbin 4-, as illustrated, is smaller than the bobbin 3, sincethe thread 19 on the bobbin 4 is preferably smaller than the thread 15and is intended to be used on only a portion of the line of stitching.

In Fig. 1 a cross section of work is illustrated in which the first partof the line of stitching is formed by a needle thread 22 and the singleshuttle thread 15, while the latter part of the line of stitching isformed by the needle thread 22 and both the shuttle thread 15 and theauxiliary shuttle thread Copies of this patent may be obtained for fivecents each, by addressing the Commissioner of Patents,

the stitch. When it is desired to employ two shuttle threads in thestitch, the operator seizes the end of the auxiliary thread and pulls itout from the shuttle sufficiently so that the auxiliary thread will becaught and drawn into the stitch by the loop of the needle thread.

The present invention is not limited to the preferred form which hasbeen illustrated and described but may be otherwise einbodied within thespirit of the invention and the scope of the following claims.

1. A sewing machine shuttle, having, in combination, a discoidal shuttlebody, a cupshaped bobbin case rotatably mounted therein, a bobbinreceiving post in the bobbin case, and a plurality of bobbins rotatablymounted on the post, substantially as described.

2. A sewing machine shuttle, having, in combination, a discoidal shuttlebody, a cupshaped bobbin case rotatably mounted therein, a bobbinreceiving post in the bobbin case, and two bobbins rotatably mounted onthe post, one of the bobbins being larger than the other, substantiallyas described.

3. A sewing machine shuttle having provision for supporting two bobbinsin axial alinement and having separate thread guides and tension devicesfor the thread drawn from the respective bobbins, substan tially asdescribed.

FREDERICK H. PERRY.

Witnesses CHESTER E. Roonns, LAURA M. GooDnIDcE.

Washington, D. C.

